ipadres 2.4Ghz and 5Ghz different

[mikeoo]

I have an Asus RT-AC68U with Merlin 378.55.
All my hardware get a fixed ip-adres with DHCP Manually Assigned IP in the router.

The probleem i have is that my phones in the house use 5Ghz and when the signal is lost it switches to 2,4Ghz.

In DHCP-Server I put my phone mac adres with ip: 192.168.0.14 and that works fine.
Then my phone lost 5Ghz wifi so it switch to 2,4Ghz and then it get an other ip-adres x.x.x.229 and not keeping the same adress. Mac adres is the same for both bands.

The log file
Aug 31 09:51:03 dnsmasq-dhcp[480]: DHCPNAK(br0) 192.168.0.229 50:2e:5c:ef:b4:4b wrong address
Aug 31 09:51:04 dnsmasq-dhcp[480]: DHCPDISCOVER(br0) 50:2e:5c:ef:b4:4b
Aug 31 09:51:04 dnsmasq-dhcp[480]: DHCPOFFER(br0) 192.168.0.14 50:2e:5c:ef:b4:4b
Aug 31 09:51:04 dnsmasq-dhcp[480]: DHCPREQUEST(br0) 192.168.0.14 50:2e:5c:ef:b4:4b
Aug 31 09:51:04 dnsmasq-dhcp[480]: DHCPACK(br0) 192.168.0.14 50:2e:5c:ef:b4:4b android-7e37a70bdf7192b0

I think the problem is that the router still thinks that x.x.x.14 is still in use the then gives an ip from the pool.

Problem is that i use Domoticz and I use that ip-adres to check if the phone is at home and becasue the 229 adres is random a can't check on the second ip-adres.

Is there a way to force the phone to always use the same ip-adres.

 

[john9527]

Sorry if I'm misunderstanding....your log extract isn't matching up with what you are saying. Assuming the mac starting with 50:2e is your android phone the log shows

The phone requesting an ipaddress 192.168.0.229 which is denied by the router (DNAK - wrong address)
The router then offers 192.168.0.14 which is accepted.

This will happen if your phone has roamed and connected to a different router/access point where it got the .229 address.

 

[mikeoo]

Sorry if I'm misunderstanding....your log extract isn't matching up with what you are saying. Assuming the mac starting with 50:2e is your android phone the log shows

The phone requesting an ip-address 192.168.0.229 which is denied by the router (DNAK - wrong address)
The router then offers 192.168.0.14 which is accepted.

This will happen if your phone has roamed and connected to a different router/access point where it got the .229 address.

I have more AP's in use indeed but they all havr DHCP off and get it from the ASUS for an IP address . The change of ip-address happens when i log off from 5Ghz en log on to 2,4 Ghz.

I logged in on 5Ghz and get IP x.x.x.14 wich is good.
I switch over to 2.4Ghz and get x.x.x.229 ip wich is not good.
When i look with ARP -A x.x.x.14 is still in the list

I think it treys a new address because x.x.x.14 is still in use at that moment. And the DNAK is maybe because the reserved MAC-adres is in the DHCP list.

If the problem is a AP is there something i can do about.

 

[john9527]

It looks like someone is assigning an ip of .229 other than the router.....could be an open access point not even under your control if it has a stronger signal and you've accidently connected in the past. Double check that the SSID is what you expect when you have the .229 address.

 

[mikeoo]

It looks like someone is assigning an ip of .229 other than the router.....could be an open access point not even under your control if it has a stronger signal. Double check that the SSID is what you expect when you have the .229 address.

Thank You. Indeed my TV Decoder have built in WiFi for AP. When i switch it off all is working fine. So have to check the settings and i think there have been an firmware update of the box and DHCP is back on.